GeForce GTX 580 3GB vs Radeon R9 Nano

Intro

Compare those specs to the Radeon R9 Nano, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The HBM memory works at a speed of 500 MHz on this specific model. It features 4096 SPUs along with 256 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 Nano		175 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 69 Watts (39%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 Nano is 166% faster than the GeForce GTX 580 3GB in general, due to its higher data rate. (explain)

Radeon R9 Nano		512000 MB/sec
GeForce GTX 580 3GB		192384 MB/sec
	Difference: 319616 (166%)

Texel Rate

The Radeon R9 Nano is much (approximately 418%) more effective at AF than the GeForce GTX 580 3GB. (explain)

Radeon R9 Nano		256000 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 206592 (418%)

Pixel Rate

The Radeon R9 Nano will be much (approximately 73%) better at anti-aliasing than the GeForce GTX 580 3GB, and will be able to handle higher resolutions while still performing well. (explain)

Radeon R9 Nano		64000 Mpixels/sec
GeForce GTX 580 3GB		37056 Mpixels/sec
	Difference: 26944 (73%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.